How a male rat behaves toward a female has been shown to alter ____ in her brain, presumably then
activating ___ receptors in some neurons.
a. peptide hormones; neurotransmitter d. neurotransmitter release; testosterone
b. neurotransmitter release; steroid hormone e. neurotransmitter release; peptide hormone
c. cAMP kinases; steroid hormone
B
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A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
Club mosses
a. are placed in the subphylum Pterophyta. b. are so-called because of the social nature of the plants. c. do not produce gametophytes. d. are so-called because most produce strobili.
The greatest volume of blood is found in the
a. aorta and arteries. b. capillaries. c. veins. d. lungs. e. heart
Water is important to biology for many reasons including because it:
What will be an ideal response?